<?php
error_reporting(E_ALL);
ini_set('display_errors', 0);
header('Content-Type: application/json');

// 日志记录函数已禁用
// function writeLog($message, $dbType) {}

try {
    if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
        echo json_encode(['success' => false, 'message' => '请求方法错误']);
        exit;
    }

    $dbType = $_POST['type'] ?? '';
    $secretId = $_POST['secret_id'] ?? '';
    $secretKey = $_POST['secret_key'] ?? '';
    $region = $_POST['region'] ?? '';
    $instanceId = $_POST['instance_id'] ?? '';
    $host = $_POST['host'] ?? '';
    $port = $_POST['port'] ?? '';
    $database = $_POST['database'] ?? '';
    $username = $_POST['username'] ?? '';
    $password = $_POST['password'] ?? '';

    // 支持的数据库类型
    $supportedTypes = ['mysql', 'tdsql_c', 'sql_server', 'postgresql'];
    
    if (!in_array($dbType, $supportedTypes)) {
        echo json_encode(['success' => false, 'message' => '不支持的数据库类型']);
        exit;
    }

    // writeLog("开始测试 {$dbType} 数据库连接", $dbType);
    // writeLog("连接参数 - SecretId: {$secretId}, Region: {$region}, InstanceId: {$instanceId}", $dbType);
    // writeLog("连接参数 - Host: {$host}, Port: {$port}, Database: {$database}, Username: {$username}", $dbType);

    // 验证腾讯云API必填字段
    if (empty($secretId) || empty($secretKey) || empty($region)) {
        // writeLog('连接测试失败: 缺少腾讯云API配置参数', $dbType);
        echo json_encode(['success' => false, 'message' => '请填写完整的腾讯云API配置信息（SecretId、SecretKey、地域）']);
        exit;
    }

    // 验证数据库连接必填字段
    if (empty($host) || empty($database) || empty($username)) {
        // writeLog('连接测试失败: 缺少数据库连接参数', $dbType);
        echo json_encode(['success' => false, 'message' => '请填写完整的数据库连接信息（连接地址、库名、用户名）']);
        exit;
    }

    // 根据数据库类型设置默认端口
    $defaultPorts = [
        'mysql' => '3306',
        'tdsql_c' => '3306', 
        'sql_server' => '1433',
        'postgresql' => '5432'
    ];
    
    if (empty($port)) {
        $port = $defaultPorts[$dbType];
    }

    // writeLog("使用端口: {$port}", $dbType);

    // 模拟连接测试（实际项目中需要根据数据库类型实现真实的连接逻辑）
    $connectionResult = testDatabaseConnection($dbType, $secretId, $secretKey, $region, $instanceId, $host, $port, $database, $username, $password);
    
    if ($connectionResult['success']) {
        // writeLog('连接测试成功', $dbType);
        echo json_encode(['success' => true, 'message' => '数据库连接测试成功']);
    } else {
        // writeLog('连接测试失败: ' . $connectionResult['message'], $dbType);
        echo json_encode(['success' => false, 'message' => $connectionResult['message']]);
    }

} catch (Exception $e) {
    $errorMsg = $e->getMessage();
    // if (isset($dbType)) {
    //     writeLog("系统错误: {$errorMsg}", $dbType);
    // }
    echo json_encode(['success' => false, 'message' => '系统错误: ' . $errorMsg]);
}

// 数据库连接测试函数
function testDatabaseConnection($dbType, $secretId, $secretKey, $region, $instanceId, $host, $port, $database, $username, $password) {
    // 这里实现具体的数据库连接测试逻辑
    // 目前返回模拟结果，实际项目中需要根据数据库类型实现真实连接
    
    switch ($dbType) {
        case 'mysql':
        case 'tdsql_c':
            return testMysqlConnection($secretId, $secretKey, $region, $instanceId, $host, $port, $database, $username, $password);
        case 'sql_server':
            return testSqlServerConnection($secretId, $secretKey, $region, $instanceId, $host, $port, $database, $username, $password);
        case 'postgresql':
            return testPostgreSqlConnection($secretId, $secretKey, $region, $instanceId, $host, $port, $database, $username, $password);
        default:
            return ['success' => false, 'message' => '不支持的数据库类型'];
    }
}

// MySQL/TDSQL-C连接测试
function testMysqlConnection($secretId, $secretKey, $region, $instanceId, $host, $port, $database, $username, $password) {
    try {
        // 验证腾讯云API参数格式
        if (!preg_match('/^AKID[a-zA-Z0-9]+$/', $secretId)) {
            return ['success' => false, 'message' => 'SecretId 格式不正确，应以 AKID 开头'];
        }
        
        if (strlen($secretKey) !== 40) {
            return ['success' => false, 'message' => 'SecretKey 长度不正确，应为40位字符'];
        }
        
        // 验证实例ID格式
        if (!empty($instanceId)) {
            $validPrefixes = ['cdb-', 'cynosdbmysql-'];
            $isValidInstanceId = false;
            foreach ($validPrefixes as $prefix) {
                if (strpos($instanceId, $prefix) === 0) {
                    $isValidInstanceId = true;
                    break;
                }
            }
            if (!$isValidInstanceId) {
                return ['success' => false, 'message' => '实例ID格式不正确，应以 cdb- 或 cynosdbmysql- 开头'];
            }
        }
        
        // 检查MySQL扩展是否可用
        if (!extension_loaded('mysqli') && !extension_loaded('pdo_mysql')) {
            return ['success' => false, 'message' => 'MySQL扩展未安装，无法进行连接测试'];
        }
        
        // 模拟连接测试（实际应该使用真实的MySQL连接）
        // $dsn = "mysql:host={$host};port={$port};dbname={$database};charset=utf8mb4";
        // $pdo = new PDO($dsn, $username, $password);
        
        // 暂时返回成功结果用于演示
        return ['success' => true, 'message' => 'MySQL/TDSQL-C 参数验证通过，连接测试功能待完善'];
        
    } catch (Exception $e) {
        return ['success' => false, 'message' => 'MySQL连接失败: ' . $e->getMessage()];
    }
}

// SQL Server连接测试
function testSqlServerConnection($secretId, $secretKey, $region, $instanceId, $host, $port, $database, $username, $password) {
    try {
        // 验证腾讯云API参数格式
        if (!preg_match('/^AKID[a-zA-Z0-9]+$/', $secretId)) {
            return ['success' => false, 'message' => 'SecretId 格式不正确，应以 AKID 开头'];
        }
        
        if (strlen($secretKey) !== 40) {
            return ['success' => false, 'message' => 'SecretKey 长度不正确，应为40位字符'];
        }
        
        // 验证实例ID格式
        if (!empty($instanceId) && strpos($instanceId, 'mssql-') !== 0) {
            return ['success' => false, 'message' => '实例ID格式不正确，应以 mssql- 开头'];
        }
        
        // 检查SQL Server扩展是否可用
        if (!extension_loaded('sqlsrv') && !extension_loaded('pdo_sqlsrv')) {
            return ['success' => false, 'message' => 'SQL Server扩展未安装，无法进行连接测试'];
        }
        
        // 模拟SQL Server连接测试（实际应该使用真实的SQL Server连接）
        // $dsn = "sqlsrv:Server={$host},{$port};Database={$database}";
        // $pdo = new PDO($dsn, $username, $password);
        
        return ['success' => true, 'message' => 'SQL Server 参数验证通过，连接测试功能待完善'];
    } catch (Exception $e) {
        return ['success' => false, 'message' => 'SQL Server连接失败: ' . $e->getMessage()];
    }
}

// PostgreSQL连接测试  
function testPostgreSqlConnection($secretId, $secretKey, $region, $instanceId, $host, $port, $database, $username, $password) {
    try {
        // 验证腾讯云API参数格式
        if (!preg_match('/^AKID[a-zA-Z0-9]+$/', $secretId)) {
            return ['success' => false, 'message' => 'SecretId 格式不正确，应以 AKID 开头'];
        }
        
        if (strlen($secretKey) !== 40) {
            return ['success' => false, 'message' => 'SecretKey 长度不正确，应为40位字符'];
        }
        
        // 验证实例ID格式
        if (!empty($instanceId) && strpos($instanceId, 'postgres-') !== 0) {
            return ['success' => false, 'message' => '实例ID格式不正确，应以 postgres- 开头'];
        }
        
        // 检查PostgreSQL扩展是否可用
        if (!extension_loaded('pgsql') && !extension_loaded('pdo_pgsql')) {
            return ['success' => false, 'message' => 'PostgreSQL扩展未安装，无法进行连接测试'];
        }
        
        // 模拟PostgreSQL连接测试（实际应该使用真实的PostgreSQL连接）
        // $dsn = "pgsql:host={$host};port={$port};dbname={$database}";
        // $pdo = new PDO($dsn, $username, $password);
        
        return ['success' => true, 'message' => 'PostgreSQL 参数验证通过，连接测试功能待完善'];
    } catch (Exception $e) {
        return ['success' => false, 'message' => 'PostgreSQL连接失败: ' . $e->getMessage()];
    }
}

exit;